Patents by Inventor Charles M. Cheatham

Charles M. Cheatham has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Chromatography of polymers
    Patent number: 10274465
    Abstract: The invention provides an apparatus for polymer chromatography, comprising at least one column that comprises a first stationary phase comprising one of the following: A) a material comprising at least one non-carbon atom, excluding glass or a metal, selected from molybdenum sulfide MoS2, tungsten sulfide WS2, silicon carbide SiC, boron nitride BN, or combinations thereof, or B) glass, or a metal, or combinations thereof, and a material comprising at least one non-carbon atom selected from molybdenum sulfide MoS2, tungsten sulfide WS2, silicon carbide SiC, boron nitride BN, or combinations thereof. The invention also provides a method for polymer chromatography, comprising introducing a solution, comprising a polymer, into a liquid flowing through a first stationary phase, and wherein the first stationary phase comprises one of foregoing materials (A) or (B).
    Type: Grant
    Filed: June 1, 2012
    Date of Patent: April 30, 2019
    Assignee: Dow Global Technologies LLC
    Inventors: Rongjuan Cong, Charles M. Cheatham, Al Parrott, Wallace W. Yau, Lonnie G. Hazlitt, Zhe Zhou, Alexander W. Degroot, Matthew D. Miller
  • CHROMATOGRAPHY OF POLYMERS
    Publication number: 20140090453
    Abstract: The invention provides an apparatus for polymer chromatography, comprising at least one column that comprises a first stationary phase comprising one of the following: A) a material comprising at least one non-carbon atom, excluding glass or a metal, selected from molybdenum sulfide MoS2, tungsten sulfide WS2, silicon carbide SiC, boron nitride BN, or combinations thereof, or B) glass, or a metal, or combinations thereof, and a material comprising at least one non-carbon atom selected from molybdenum sulfide MoS2, tungsten sulfide WS2, silicon carbide SiC, boron nitride BN, or combinations thereof. The invention also provides a method for polymer chromatography, comprising introducing a solution, comprising a polymer, into a liquid flowing through a first stationary phase, and wherein the first stationary phase comprises one of foregoing materials (A) or (B).
    Type: Application
    Filed: June 1, 2012
    Publication date: April 3, 2014
    Applicant: DOW GLOBAL TECHNOLOGIES LLC
    Inventors: Rongjuan Cong, Charles M. Cheatham, Al Parrott, Wallace W. Yau, Lonnie G. Hazlitt, Zhe Zhou, Alexander W. Degroot, Matthew D. Miller
  • Method and apparatus for determining melt elasticity
    Patent number: 8334362
    Abstract: An apparatus and method for determining the standardized melt elasticity (sME) force of a thermoplastic polymer needed to stretch a strand of melted polymer at a speed about thirty three times faster than the speed of strand formation from a body of melted polymer under constant stress from an unencumbered dead weighted piston.
    Type: Grant
    Filed: November 18, 2009
    Date of Patent: December 18, 2012
    Assignee: Dow Global Technologies LLC
    Inventors: Mark D. Alpeter, Marc A. Mangnus, Charles M. Cheatham, Marinus G. Nieuwenhuize, Jack M. Potter, Jr.
  • METHOD AND APPARATUS FOR DETERMINING MELT ELASTICITY
    Publication number: 20110103425
    Abstract: An apparatus and method for determining the standardized melt elasticity (sME) force of a thermoplastic polymer needed to stretch a strand of melted polymer at a speed about thirty three times faster than the speed of strand formation from a body of melted polymer under constant stress from an unencumbered dead weighted piston.
    Type: Application
    Filed: November 18, 2009
    Publication date: May 5, 2011
    Inventors: MARK D. ALPETER, MARC A. MANGNUS, CHARLES M. CHEATHAM, MARINUS G. NIEUWENHUIZE, JACK M. POTTER, JR.